Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 10, Issue 44, Pages 8800-8807Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ob26631h
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- CSIR, New Delhi, India
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Cholesterol appended pyridinium ureas 1 and 2 have been designed and synthesized. The unsymmetrical urea-based chemosensor 1 fluorimetrically distinguishes F- from the other anions examined in both CH3CN and DMSO with appreciable binding constant values. The pyridinium - based symmetrical compound 2 acts as a low molecular weight gelator (LMWG) in CHCl3 and is capable of detecting F- visually by breaking the gel. On the contrary, the chemosensor 1 in DMSO in the presence of tetrabutylammonium fluoride undergoes a change from sol to gel state that produces an unambiguous visual readout of F-.
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